(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

Xerox Disclosure Journal

Abstract

In copiers and scanners, it is necessary to control the amount of light produced by the lamp which illuminates the original document. This is often done by phase controlling the AC line voltage applied to the illumination lamp using a triac and some feedback method to maintain the proper lamp voltage and light output. The feedback method is often solely implemented using electrical hardware. Use of a triac usually requires that an inductor be added to prevent the turn-on voltage rise time from being too fast, which generates electrical noise and failure to meet the requirements of regulatory agencies' radiated and conductive emissions limits. The inductor required can be large and expensive. Also, triacs require special gating circuitry owing to their more difficult input gating requirements. Precise control of the lamp voltage is more difficult using triacs, as the variabilities in the triac gating can lead to errors in the lamp voltage control.

Country

Undisclosed

Language

English (United States)

This text was extracted from a PDF file.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
54% of the total text.

Page 1 of 2

In copiers and scanners, it is necessary to control the amount of light produced by the lamp which illuminates the original document. This is often done by phase controlling the AC line voltage applied to the illumination lamp using a triac and some feedback method to maintain the proper lamp voltage and light output. The feedback method is often solely implemented using electrical hardware. Use of a triac usually requires that an inductor be added to prevent the turn-on voltage rise time from being too fast, which generates electrical noise and failure to meet the requirements of regulatory agencies' radiated and conductive emissions limits. The inductor required can be large and expensive. Also, triacs require special gating circuitry owing to their more difficult input gating requirements. Precise control of the lamp voltage is more difficult using triacs, as the variabilities in the triac gating can lead to errors in the lamp voltage control.

Existing problems in triac illumination control circuits are expensive and inefficient. Control of the turn-on voltage waveform is difficult and expensive to implement. Accuracy of the desired lamp voltage is difficult to achieve. Use of electrical hardware based control circuits to produce the controlling feedback increases cost, complexity, and reduces reliability and flexibility.

It is proposed to control the illumination lamp voltage using a power-Mosfet driver circuit. Circuitry also senses the current and voltage of the AC power input to the M...